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Altera_Forum's avatar
Altera_Forum
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16 years ago

problem with cyclone III and jtag

I would like to put a very serious discussion about using jtag with cyclone III. has cyclone3 less electrical tolerance compared to other FPGA's?????? . we are building a custom board. and t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

It shouldn't damage the FPGA, as long as the voltage never goes above 4.1V. The I/O voltage used for the JTAG pins is the same than for bank 1, and extra care should be taken if you are using a supply voltage of 3.0 or 3.3v.

Any high speed buffer should do the trick. We use 74LVC541 chips and they work fine.